I, also am suffering this issue. At first, I blamed it on my satellite internet being unstable. I did, upon reboot (XboxOne) manage to get the Yule festival back. Then, lost it again. Now it seems gone forever. I love the AC franchise, and thought I would not like this one as much as Odyssey (I am a history junkie). But I am enjoying hanging out with Eivor the hot viking! lol (I chose the male version) But this has truly been the buggiest game, ever! I have made observance (because UBI doesn't answer their service tickets, very quickly) that when I have the dreaded "corrupt data" bug, that takes your game play back 1-8 hours, and this Yule issue, it seems to have to do with the UBI server. I was forced to work from home (covid) and have been dealing with jammed servers with MS, and horrible quality with webinars and conference calls, etc. I think the whole world is dealing with difficult internet. However..... for a single player, stand alone game, AC Valhalla should be performing so much better! The reason we buy the software, is so we can play offline. Now we are being held hostage to a crowded server. I will keep trolling for fixes.. and hope you gamer buddies have a better New Year!